A pipe fitting

Abstract

The present invention discloses a pipe fitting connector, belonging to the technical field of pipe fitting connection. This six-way connector for square pipes includes a connector with a cavity inside, and mortises communicating with the cavity are opened on at least one side surface. The expansion tenon includes a horizontal part, a tail part and a tenon head. The tenon head is provided as a pair, and both ends of the pair of tenon heads are fixed on both sides of the end of the horizontal part. An arc-shaped guiding slope is provided at the connection between the pair of tenon heads and the horizontal part. A guiding arc adapted to the arc-shaped guiding slope is opened on the inner side of the mortise. The expansion block group includes a first expansion block and a second expansion block that are mutually joined. Expansion tenon grooves are provided on the joined surfaces of the first expansion block and the second expansion block. The connector and the pipe fitting are preliminarily connected by inserting the expansion tenon into the mortise opened on the connector, and then the first expansion block and the second expansion block are respectively moved in opposite directions by rotating the expansion tenon to be closely attached to the pipe wall of the pipe fitting, further improving the stable connection between the connector and the pipe fitting.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting connection, and particularly relates to a pipe fitting connector. Background Art

[0002] The connection between pipe fittings is generally achieved through pipe fitting connectors. Existing products on the market that are connected by pipe fitting connectors to square pipes or round pipes, such as storage racks, shelves, guardrails, etc., have acceptable stability under static conditions, but may become loose or deformed after long-term use. Under dynamic loads (such as vibration, impact), the connection is more likely to become loose, resulting in structural instability. For example, if a storage rack or shelf becomes loose or collapses, it may cause items to fall, resulting in property damage or personal injury. If a guardrail becomes loose or unstable, it may cause the guardrail to fail and lose its protective function, increasing safety hazards. Therefore, it is necessary to improve the connection stability between the pipe fitting connector and the pipe fitting.

[0003] Existing pipe fitting connectors, such as right-angle connectors, T-shaped connectors, cross connectors, L-shaped connectors, etc., usually use the plug-in method for connection. Reinforcing ribs are provided at the socket of the pipe fitting connector, and fastening is achieved through the friction between the reinforcing ribs and the inner wall of the pipe fitting. The connection stability depends on the friction force between the reinforcing ribs and the inner wall of the pipe. After long-term use or under the action of external forces (such as vibration, impact), it is easy to become loose, affecting the structural stability. At the same time, the cooperation between the reinforcing ribs and the inner wall of the pipe fitting requires high precision. If there are dimensional deviations in the pipe or manufacturing errors in the pipe fitting connector, it is also easy to cause insecure connection. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and provide a pipe fitting connector to improve the connection stability between the connector and the pipe fitting.

[0005] The present invention provides a pipe fitting connector, including a connector with a cavity inside. The connector has multiple sides, and at least one side is provided with a mortise communicating with the cavity. The expansion tenon includes a horizontal part, a tail part, and a tenon head. The tenon head is provided as a pair, and both of the pair of tenon heads are fixed to both sides of the end of the horizontal part. The tail part is a frustum of a cone with an outer diameter gradually increasing from the end connected to the horizontal part. An arc-shaped guiding slope is provided at the connection between the pair of tenon heads and the horizontal part. A guiding arc adapted to the arc-shaped guiding slope is provided inside the mortise. The mortise has through holes corresponding to the end of the horizontal part and the two tenon heads. The expansion block group includes a first expansion block and a second expansion block that are fitted together. Both the mating surfaces of the first expansion block and the second expansion block have expansion tenon grooves. The expansion tenon groove on the first expansion block and the expansion tenon groove on the second expansion block form a receiving cavity for accommodating the horizontal part and the tail part after the first expansion block and the second expansion block are fitted together. The outer surface after the first expansion block and the second expansion block are spliced is adapted to the inner surface of the pipe fitting. When the expansion tenon is inserted into the mortise and the expansion block group contacts the outer surface of the connector, there is an overlapping area between the pair of tenon heads and the inner side wall of the mortise along the axis direction of the horizontal part. When the connector rotates by a certain angle, the tenon head advances along the arc-shaped guiding slope so that the overlapping area enters the cavity.

[0006] Preferably, the expansion tenon groove includes a semi-circular groove and an inclined groove. The horizontal part is located in the semi-circular groove, and the tail part is located in the inclined groove.

[0007] Preferably, the bottom of the first expansion block is provided with a convex connecting block, the top of the second expansion block is provided with a concave connecting groove, and the mating surface of the concave connecting groove and the convex connecting block is connected by a wedge-shaped surface. And the outer surface after the first expansion block and the second expansion block are spliced is attached to the inner side wall of the pipe fitting to be connected.

[0008] Preferably, the mortise includes a cylindrical through hole and rectangular through holes on both sides of the cylindrical through hole. The cylindrical through hole is adapted to the horizontal part, and the rectangular through holes on both sides of the cylindrical through hole are respectively adapted to the pair of tenon heads.

[0009] Preferably, the end of the horizontal part is provided with an inclined cutting surface.

[0010] Preferably, the outer surface contour of the expansion block group after the first expansion block and the second expansion block are spliced is circular, square or elliptical.

[0011] Preferably, the length of the overlapping area along the axis direction of the horizontal part is 1 mm. When the expansion tenon rotates 90°, the angles of the tails of the first expansion block and the second expansion block expanding and lifting along the axis direction of the horizontal part are both 3°.

[0012] Preferably, the connector is set as a cube, and mortises are arranged on six faces of the connector.

[0013] Preferably, the mortises are arranged at the centers of the side faces of the connector.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: For a pipe fitting connector of the present invention, first, an expansion tenon is inserted into an expansion block group, and then the expansion block group is inserted into a pipe fitting to be connected. At this time, the horizontal part and the tenon head are inserted into the mortises for preliminary connection. There is an overlapping area between the tenon head and the inner side wall of the mortise along the axis direction of the horizontal part, and the arc-shaped guiding slope opened on the tenon head fits the guiding arc. Then, the expansion block group is rotated clockwise. Under the action of the arc-shaped guiding slope and the guiding arc, the tenon head will further move into the inner cavity of the connector, generating a pulling effect. The first expansion block and the second expansion block completely wrap the horizontal part and the tail. Since the tail is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part, when the tail generates a forward displacement, the first expansion block and the second expansion block will be squeezed to both sides, so that the first expansion block and the second expansion block are closely attached to the inner side wall of the pipe fitting to be connected. By generating surface friction between the first expansion block and the second expansion block and the inner side wall of the pipe fitting, the friction surface is larger and firmer, thereby realizing the tight connection between the connector and the pipe fitting, further improving the connection stability between the connector and the pipe fitting, and avoiding accidents. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure when the expansion tenon of the present invention is initially inserted into the connector.

[0016] Figure 2 It is a schematic diagram of the overall structure after the pipe fitting is rotated 90° and the first expansion block and the second expansion block are expanded.

[0017] Figure 3 It is a schematic diagram of the structure of the expansion tenon of the present invention.

[0018] Figure 4 It is a schematic diagram of the structure of the first expansion block of the present invention.

[0019] Figure 5 It is a schematic diagram of the structure of the second expansion block of the present invention.

[0020] Figure 6 It is a schematic diagram of the structure of the connector of the present invention.

[0021] Explanation of the reference numerals in the accompanying drawings: 1. Connector; 2. Expansion tenon; 21. Horizontal portion; 22. Tail portion; 3. Expansion block group; 31. First expansion block; 32. Second expansion block; 4. Mortise; 5. Tenon; 6. Guide arc; 7. Arc-shaped guide slope; 8. Cylindrical through hole; 9. Expansion tenon groove; 901. Semi-annular groove; 902. Inclined groove; 10. Concave connecting groove; 11. Convex connecting block. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1 to 6 In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the usual meanings understood by people with general skills in the field to which the present invention belongs.

[0023] The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. "Inside", "outside", "upper", "lower", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The drawings in the present invention are not drawn strictly according to the actual scale. The specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structure.

[0024] The present invention provides a pipe connector, such as Figures 1 to 6As shown in the figure, it includes a connector 1 with a cavity inside. The connector 1 has multiple sides, and mortises 4 communicating with the cavity are provided on at least one side. The expansion tenon 2 includes a horizontal part 21, a tail part 22 and a tenon head 5. The tenon head 5 is provided as a pair, and both of the pair of tenon heads 5 are fixed to both sides of the end of the horizontal part 21. The tail part 22 is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part 21. An arc-shaped guiding slope 7 is provided at the connection between the pair of tenon heads 5 and the horizontal part 21. A guiding arc 6 adapted to the arc-shaped guiding slope 7 is provided inside the mortise 4. The mortise 4 has through holes corresponding to the end of the horizontal part 21 and the two tenon heads 5. The expansion block group 3 includes a first expansion block 31 and a second expansion block 32 that are joined together. Expansion tenon grooves 9 are provided on the joining surfaces of the first expansion block 31 and the second expansion block 32. The expansion tenon groove 9 on the first expansion block 31 and the expansion tenon groove 9 on the second expansion block 32 form a receiving cavity for receiving the horizontal part 21 and the tail part 22 after the first expansion block 31 and the second expansion block 32 are joined together. The outer surface after the first expansion block 31 and the second expansion block 32 are joined is adapted to the inner surface of the pipe fitting. When the expansion tenon 2 is inserted into the mortise 4 and the expansion block group 3 contacts the outer surface of the connector 1, there is an overlapping area between the pair of tenon heads 5 and the inner side wall of the mortise 4 along the axis direction of the horizontal part 21. When the connector 1 rotates by a certain angle, the tenon head 5 advances along the arc-shaped guiding slope 7 so that the overlapping area enters the cavity.

[0025] First, the expansion tenon 2 is installed in the expansion block group 3, and then the expansion block group 3 is inserted into the pipe fitting that needs to be connected. At this time, the horizontal part 21 and the tenon head 5 are inserted into the mortise 4 for preliminary connection. There is an overlapping area between the tenon head 5 and the inner side wall of the mortise 4 along the axis direction of the horizontal part 21, and the arc-shaped guiding slope 7 provided on the tenon head 5 fits with the guiding arc 6. At this time, the expansion block group 3 is rotated clockwise. Under the action of the arc-shaped guiding slope 7 and the guiding arc 6, the tenon head 5 will further move into the inner cavity of the connector 1, and a pulling effect will be generated. The first expansion block 31 and the second expansion block 32 completely wrap the horizontal part 21 and the tail part 22. Since the tail part 22 is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part 21, when the tail part 22 generates a forward displacement, it will squeeze the first expansion block 31 and the second expansion block 32 to both sides, so that the first expansion block 31 and the second expansion block 32 are closely attached to the inner side wall of the pipe fitting that needs to be connected. The surface friction between the first expansion block 31 and the second expansion block 32 and the inner side wall of the pipe fitting is larger and firmer, thereby realizing the tight connection between the connector 1 and the pipe fitting, further improving the connection stability between the connector 1 and the pipe fitting, and avoiding accidents.

[0026] Preferably, as Figures 1 to 4 shown, the expansion tenon groove 9 includes a semi-circular groove 901 and an inclined groove 902. The horizontal part 21 is located in the semi-circular groove 901, and the tail part 22 is located in the inclined groove 902.

[0027] The expansion tenon groove 9 includes a semi-circular groove 901 and an inclined groove 902. Since the tail part 22 is a frustum with an outer diameter gradually increasing from the end connected to the horizontal part 21, when the horizontal part 21 and the tail part 22 of the expansion tenon 2 move, the first expansion block 31 and the second expansion block 32 will be squeezed to both sides, so that the first expansion block 31 and the second expansion block 32 are closely attached to the inner side wall of the pipe fitting and squeeze the side wall of the pipe fitting. The friction surface generated between the first expansion block 31 and the second expansion block 32 and the inner side wall of the pipe fitting is larger and firmer, thereby improving the connection stability between the connector 1 and the pipe fitting.

[0028] Preferably, as Figures 1 to 6 shown, a convex connecting block 11 is provided at the bottom of the first expansion block 31, a concave connecting groove 10 is provided at the top of the second expansion block 32, and the fitting surface of the concave connecting groove 10 and the convex connecting block 11 is connected by a wedge surface. And the outer surface of the first expansion block 31 and the second expansion block 32 after splicing fits the inner side wall of the pipe fitting to be connected. The mortise 4 includes a cylindrical through hole 8 and rectangular through holes on both sides of the cylindrical through hole 8. The cylindrical through hole 8 is adapted to the horizontal part 21, and the rectangular through holes on both sides of the cylindrical through hole 8 are respectively adapted to a pair of tenons 5.

[0029] In the present invention, a convex connecting block 11 is provided at the bottom of the first expansion block 31, a concave connecting groove 10 is provided at the top of the second expansion block 32, and the fitting surface of the concave connecting groove 10 and the convex connecting block 11 is connected by a wedge surface, so that the first expansion block 31 and the second expansion block 32 can stably move to both sides. The cylindrical through hole 8 is adapted to the horizontal part 21, and the rectangular through holes on both sides of the cylindrical through hole 8 are respectively adapted to a pair of tenons 5, so as to make the connection between the connector 1 and the pipe fitting more stable.

[0030] Preferably, as Figure 6 shown, an inclined cutting surface is provided at the end of the horizontal part 21. The outer surface profile of the expansion block group 3 formed by splicing the first expansion block 31 and the second expansion block 32 is circular, square or oval, and the length of the overlapping area along the axis direction of the horizontal part 21 is 1 mm. When the expansion tenon 2 rotates 90°, the angles of the tails 22 of the first expansion block 31 and the second expansion block 32 expanding and lifting along the axis direction of the horizontal part 21 are both 3°.

[0031] In the present invention, the longitudinal section of the expansion block group 3 formed by splicing the first expansion block 31 and the second expansion block 32 is circular, square or oval, and can be used to connect square pipes, round pipes or oval pipes, making the device provided by the present invention diverse. There is an overlapping area between the inner side walls of the tenon 5 and the mortise 4 along the axis direction of the horizontal part 21, and the length of the overlapping area along the axis direction of the horizontal part 21 is 1 mm. When the expansion tenon 2 rotates 90°, the angles of the tails 22 of the first expansion block 31 and the second expansion block 32 expanding and lifting along the axis direction of the horizontal part 21 are both 3°, avoiding insufficient friction due to too small a lifting angle and also avoiding damage to the pipe fittings due to too large a lifting angle.

[0032] Preferably, the connector 1 is arranged as a cube, and mortises 4 are arranged on all six faces of the connector 1, and the mortises 4 are arranged at the centers of the side faces of the connector 1.

[0033] In the present invention, the connector 1 is arranged as a cube, and mortises 4 are arranged on all six faces, so that pipe fittings in different directions can be connected according to actual usage conditions, which is convenient and fast. Moreover, in the present invention, the mortises 4 are arranged at the centers of the side faces of the connector 1, making the connection between the connector 1 and the pipe fittings closer and improving the aesthetics of the connection between the connector 1 and the pipe fittings.

[0034] The usage method of the pipe fitting connector of the present invention is as follows:

[0035] First, insert the expansion tenon 2 into the expansion block group 3, and then insert the expansion block group 3 into the pipe fittings to be connected first. At this time, insert the expansion tenon 2 into the mortise 4 for preliminary connection. At this time, there is a 1-mm overlapping area between a pair of tenons 5 and the inner side walls of the mortises 4 along the axis direction of the horizontal part 21, and the arc-shaped guiding slope 7 provided on the tenon 5 fits with the guiding arc 6;

[0036] Then rotate the connector 1 clockwise by 90°. Under the action of the arc-shaped guiding slope 7 and the guiding arc 6, the tenon 5 will further move into the inner cavity of the connector 1, generating a pulling effect. During the pulling process, the expansion tenon 2 will expand the first expansion block 31 and the second expansion block 32, making the first expansion block 31 and the second expansion block 32 closely adhere to the inner side walls of the pipe fittings to be connected, thereby achieving a tight connection between the connector 1 and the pipe fittings through expansion friction with the pipe fitting ports.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe fitting connector, characterized in that, Comprising: A connector (1) with a cavity inside. The connector (1) has a plurality of side faces, and a mortise (4) communicating with the cavity is provided on at least one side face. An expansion tenon (2), including a horizontal part (21), a tail part (22) and a tenon head (5). The tenon head (5) is provided as a pair, and both of the pair of tenon heads (5) are fixed on both sides of the end of the horizontal part (21). The tail part (22) is a frustum of a cone with an outer diameter gradually increasing from the end connected to the horizontal part (21) outward. An arc-shaped guiding slope (7) is provided at the connection between the pair of tenon heads (5) and the horizontal part (21). A guiding arc (6) adapted to the arc-shaped guiding slope (7) is provided on the inner side of the mortise (4). The mortise (4) has through holes corresponding to the end of the horizontal part (21) and the two tenon heads (5). An expansion block group (3), including a first expansion block (31) and a second expansion block (32) that are joined together. Both of the joining faces of the first expansion block (31) and the second expansion block (32) have expansion tenon grooves (9). The expansion tenon groove (9) on the first expansion block (31) and the expansion tenon groove (9) on the second expansion block (32) form a receiving cavity for accommodating the horizontal part (21) and the tail part (22) after the first expansion block (31) and the second expansion block (32) are joined together. The outer surface after the first expansion block (31) and the second expansion block (32) are joined is adapted to the inner surface of the pipe fitting. When the expansion tenon (2) is inserted into the mortise (4) and the expansion block group (3) contacts the outer surface of the connector (1), there is an overlapping area between the pair of tenon heads (5) and the inner side wall of the mortise (4) along the axis direction of the horizontal part (21). When the connector (1) rotates a certain angle, the tenon head (5) advances along the arc-shaped guiding slope (7) so that the overlapping area enters the cavity. A convex connecting block (11) is provided at the bottom of the first expansion block (31), and a concave connecting groove (10) is provided at the top of the second expansion block (32). The joint surface of the concave connecting groove (10) and the convex connecting block (11) is connected by a wedge-shaped surface, and the outer surface after the first expansion block (31) and the second expansion block (32) are joined is attached to the inner side wall of the pipe fitting to be connected. The length of the overlapping area along the axis direction of the horizontal part (21) is 1 mm. When the expansion tenon (2) rotates 90°, the angles of the tails of the first expansion block (31) and the second expansion block (32) expanding and lifting along the axis direction of the horizontal part (21) are both 3°. The connector (1) is provided as a cube, and the mortise (4) is provided on all six faces of the connector (1).

2. The pipe fitting connector according to claim 1, characterized in that, The expansion tenon groove (9) includes a semi-circular groove (901) and an inclined groove (902). The horizontal part (21) is located in the semi-circular groove (901), and the tail part (22) is located in the inclined groove (902).

3. The pipe fitting connector according to claim 1, characterized in that, The mortise (4) includes a cylindrical through-hole (8) and rectangular through-holes on both sides of the cylindrical through-hole (8). The cylindrical through-hole (8) is adapted to the horizontal portion (21), and the rectangular through-holes on both sides of the cylindrical through-hole (8) are respectively adapted to a pair of tenons (5).

4. A pipe fitting connector according to claim 1, characterized in that, An inclined cutting surface is provided at the end of the horizontal portion (21).

5. A pipe fitting connector according to claim 1, characterized in that, The outer surface profile of the expansion block group (3) formed by splicing the first expansion block (31) and the second expansion block (32) is circular, square or oval.

6. A pipe fitting connector according to claim 1, characterized in that, The mortise (4) is provided at the center of the side surface of the connector (1).

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